Unlike most other permissions (Webcam access, Audio/Video autoplay, Location, etc…), the ability to play "protected content" is toggled with a global option in about:preferences, and can't be changed per-site. It'd be nice to have more granular control, so DRM can be enabled only on sites which actually need it, and not on any random site with an Ad which tries to play Widevine content. Equally, there are some sites with non-DRM fallbacks which may be preferable, and having to disable/enabled DRM globally is unpleasant.
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